[Asterisk-Users] Fax via email

[Ray Burkholder]

You may want to take a look t.38, t.39 which are the fax/ip/smtp
standards.  If Asterisk could be made to do this, then it would join the
mainstream and inter-op with cisco gw's and such handling this sort of
thing automagically for the billions of voice/fax minutes served.

> -----Original Message-----
> From: asterisk-users-admin at lists.digium.com 
> [mailto:asterisk-users-admin at lists.digium.com] On Behalf Of 
> Kevin P. Fleming
> Sent: Wednesday, June 09, 2004 00:33
> To: asterisk-users at lists.digium.com
> Subject: Re: [Asterisk-Users] Fax via email
> 
> 
> Steve Underwood wrote:
> 
> > If you want to FAX over IP you need to be *very* careful if 
> you want it 
> > to be reliable. You cannot use anything other than A-law or 
> u-law as the 
> > codec. However, even using those, any data slips will kill the FAX 
> > operation. If the two boxes are on the same LAN it tends to work OK.
> 
> Yes, I would think that this sort of application would be 
> either local 
> LAN or _extremely_ low latency WAN connections only, and probably not 
> use audio compression at all. If you can't handle a few 
> 64kb/s streams 
> of audio for your FAXing application, then you have other problems to 
> worry about :-)
> 
> > I mean CPU loading. HylaFAX only does 1D coding (unless 
> that changed 
> > very recently) and the ECM is brand new. The features you 
> list may be a 
> > lot less well tested than you think. :-) Also, only a tiny 
> fraction of 
> > FAX machines can even support ECM.
> 
> As mentioned in the other replies, these are no longer true 
> statements 
> as of HylaFAX 4.2.0 (which is not yet released, but very close). And 
> putting the virtual modem client and HylaFAX on a separate box from 
> Asterisk should eliminate CPU consumption concerns, I'd think.
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